The Study Of Fluid-Solid Coupling Seepage Flow Of Coal-Bed Gas

Coal-bed gas is a sort of nature gas which lies in coal bed and appears in the course of forming of the coal. Coal-bed gas not only is a harm to safety production of mining, but also makes a lot of giant accidents. But as a burnt gas, coal-bed gas is a kind of valuable energy. Especially with the shortage of energy, if coal-bed gas can be utilized , the good social effect and economic effect will emerge. But because of the complexity of coal seam construction and the law of gas flow, gas is mainly discharged and has not realized real effective use. For the use of this energy, the law of gas flow must be recognized in theory at first so as to simulate actual coal seam gas flow situation and lay the theoretical foundation of the exploitation of coal-bed gas in reality.In my paper, the storage characteristic of the coal seam and mechanical properties of gas-filled coal is introduced firstly, as offers the basis of the study of physical parameter and effective stress of coal and the foundation of the mathematical model of fluid-solid coupling of coal-bed gas. In addition, this paper founds the relation of porosity, permeability and swelling deformation under considering swelling deformation made by gas-filled coal and analysis the relation of swelling stress andeffective stress of coal. Finally on the basis of above analysis, the mathematical model of fluid-solid coupling of coal-bed gas is set up with the relation of porosity, permeability and swelling deformation and the relation of swelling stress and effective stress of coal. And the program of simulation of fluid-solid coupling of coal-bed gas and gas seepage is worked out by the computer language of C on the condition of laneway wall, and the simulation results of two kinds of models is compared and analyzed.